# 40 CFR § 503.13 - Pollutant limits.

§ 503.13 Pollutant limits.

(a) Sewage sludge.

(1) Bulk sewage sludge or sewage sludge sold or given away in a bag or other container shall not be applied to the land if the concentration of any pollutant in the sewage sludge exceeds the ceiling concentration for the pollutant in Table 1 of § 503.13.

(2) If bulk sewage sludge is applied to agricultural land, forest, a public contact site, or a reclamation site, either:

(i) The cumulative loading rate for each pollutant shall not exceed the cumulative pollutant loading rate for the pollutant in Table 2 of § 503.13; or

(ii) The concentration of each pollutant in the sewage sludge shall not exceed the concentration for the pollutant in Table 3 of § 503.13.

(3) If bulk sewage sludge is applied to a lawn or a home garden, the concentration of each pollutant in the sewage sludge shall not exceed the concentration for the pollutant in Table 3 of § 503.13.

(4) If sewage sludge is sold or given away in a bag or other container for application to the land, either:

(i) The concentration of each pollutant in the sewage sludge shall not exceed the concentration for the pollutant in Table 3 of § 503.13; or

(ii) The product of the concentration of each pollutant in the sewage sludge and the annual whole sludge application rate for the sewage sludge shall not cause the annual pollutant loading rate for the pollutant in Table 4 of § 503.13 to be exceeded. The procedure used to determine the annual whole sludge application rate is presented in appendix A of this part.

(1) Ceiling concentrations.

Table 1 of § 503.13 - Ceiling Concentrations

Pollutant Ceiling concentration (milligrams per kilogram) 1
Arsenic 75
Copper 4300
Mercury 57
Molybdenum 75
Nickel 420
Selenium 100
Zinc 7500

1 Dry weight basis.

Arsenic 41
Copper 1500
Mercury 17
Nickel 420
Selenium 100
Zinc 2800

(3) Pollutant concentrations.

Table 3 of § 503.13 - Pollutant Concentrations

Pollutant Monthly average concentration (milligrams per kilogram) 1
Arsenic 41
Copper 1500
Mercury 17
Nickel 420
Selenium 100
Zinc 2800

1 Dry weight basis.

Pollutant Annual pollutant loading rate (kilograms per hectare per 365 day period)
Arsenic 2.0
Copper 75
$\mathrm{AAR}=\frac{N}{0.0026}\phantom{\rule{0ex}{0ex}}\text{Eq. (1)}$